This is happening to me too. WP 2.0.4
http://www.node101sanantonio.org/
I’ve fixed it twice so far this morning. 🙁
I’m having the same problem at http://node101sanantonio.org with WP 2.0.4. My theme will stick around for most of the day but at some point it reverts to the default theme. I’ve tried re-uploading all the theme files and tried using a different theme but that didn’t work. I tried deleting the default theme but when it reverted my site was just blank!
